Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronism swimming", "synchronising swimming"
"synchronised stemming" » "synchronism stemming", "synchronising stemming", "synchronised steering", "synchronised flemming", "synchronised stepping"
"synchronize streaming" » "synchronism streaming", "synchronizing streaming", "synchronize treating"
"synchronized streaming" » "synchronismd streaming", "synchronizingd streaming", "synchronized treating"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("synchronised swimming") or ((("synchronised stemming") or ((("synchronize streaming") OR ("synchronized streaming"))))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("synchronised swimming") OR ((("synchronised stemming") OR ((("synchronize streaming") OR ("synchronized streaming")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"synchronised swimming\") or (((\"synchronised stemming\") or (((\"synchronize streaming\") OR (\"synchronized streaming\"))))))".
• Removing quotes may allow a broader search: (( synchronised swimming ) or ((( synchronised stemming ) or ((( synchronize streaming ) OR ( synchronized streaming )))))).
• Adding a wildcard symbol may retrieve word variants: (("synchronised swimming") or ((("synchronised stemming") or ((("synchronize streaming") OR ("synchronized streaming"))))))*.